Took my C300 to dealership, they said the light/rain sensor needs to be replaced. Ordered it from eBay. Removed the old sensor, put the new one back there (by the way, putting metalic side clips and holes in the mounting place in the windshield area is a total pain and is not as easy as shown in this video,). After I plugged the power wire into the sensor, I still see the error: Auto light function inoperative shown on thr dashboard. Took it to Mercedes dealership in Indianapolis, they said it needs to be programmed! and they charged me $182 to just program it, and it finally works. Mercedes cars have so many electronic issues & are expensive to maintain.
I wish I had read the messages of the video before buying the new sensor at the stealership and finding out that it will need the car to be reprogrammed in order to recognize it.
Man your the best ! When i checked with my friend who owns workshop for luxury cars he told me it may risk the glass. After watching ur video it seems as a bluff.
@@ScottElliott152 So Glad I found this! Mine started doing it a week ago and Mercedez BenzSydney are the biggest rip off artists in the world! I'll pull mine out, get the part number and order off eBay same as you did :) Thank you!
hey scott long time no see just a question with your DAS XENTRY car diagnostic tools are you able to enter into the headlight module and switch intelligent lighting on or off? i wish to switch off my intelligent light system permenantly off
I bought the software preinstalled on an external HDD from here: www.obdexpress.co.uk/?gclid=EAIaIQobChMI-Ja4ubGK3gIVjLaWCh0Itg-3EAAYASAAEgKGc_D_BwE Once I got used to it I joined www.mhhauto.com and downloaded earlier versions of Xentry/DAS that allow you to do things like change the variant coding. After 01-2011 MB starting locking things down so later versions don't give much access to anything. I mostly use DAS 08-2008 on a virtual machine using VMWare.
My c200 auto lights keep coming up on the dash and the wipers have a mind of their own i have them on the off setting and they still work at intermediate speed.They can be working but i can not change the speed or activate the washer fluid
I replaced the sensor but the light still did not reset. any ideas?? the fog lights turn on the way they should but the dummy light is still reading that its bad...
No ideas as I had no issues replacing it. Everything worked again as it should. You could try disconnecting the negative battery terminal for 10 minutes or so.
he used his skills and a pick tool as demonstrated in the video. the more I own my w212, the more I realize every system is designed to turn into a repair opportunity. 🙂
Hi Stuart, I replaced the old faulty sensor # ending in 8185 with new sensor #7801 and the error is still coming up. Not sure what I should do next. Any Ideas or suggestions very welcome. thanks, Patrick
You may need to remove the negative battery terminal for a few minutes. Also turn the lights off ... that is not on auto ... then turn them back to auto.
My sensor works sometimes (No reasction vs over reaction in rain) and auto lights seem slightly unreliable. No error codes. Just know it had a replacement screen at some point. Any ideas on fix? Thanks
No I didn't. If you're still getting the message then something's not right. Perhaps the sensor is not compatible ... is it new or used? Turn the lights off for a while. Also you could try disconnecting the battery for a short period which resets many of the control modules.
It is new. I did check to make sure that it is compatible. I'll try disconnecting the battery next. I thank you very much for responding to my question. I'll let you know how it works out for me. Thanks again for your help.
@robertsessions8139 I showed everything I did in the video. After replacing the part, it worked again but the Dealers always say things need to be coded. If your rain sensor is faulty, you have no option but to replace it. You'll soon know if it's going to work and maybe some cars need coding but that wasn't my experience. What if you're in a more remote area .... are Mercedes going to leave you stranded because an item needs coding? I doubt a countries design rules would allow that to happen.
@@robertsessions8139This was just posted by MariusPenta. Hello, I have replaced successfully rain sensor A2048704726, from w204 220cdi '08, with A2049017801. No coding was required. Maybe this info will help someone.
It depends if your car has the software already installed for the rain sensor wipers. If it has then you would need to edit the coding. If your car doesn't have provision for the rain sensing wipers (you don't say what you have) then you'll only be able to use the light sensor.
Scott Elliott my currently sensor installed is A 204 870 3526. How i can find out if my car is having provision for the rain sensing wipers? Thx! (Vin: WDD2040021A320997)
@@marianbarbu8513 You'd have to connect it to DAS/Xentry to read the current coding. See if you can find an independent with the Mercedes software. That part number is a combined rain/light sensor so it might be a case of activating the rain sensor wipers.
Hi scott, just wondering as my wiper works totally fine in auto but when i turn on my key i got message of auto light inoperative as light remains on always, is that the same problem from sensor or different things.
@@ScottElliott152 my car is completely same car with same parts number that you are showing so do i have to change as same like you did and is there any other parts number i can suit to this part as in Australia its pretty expensive. Highly appreciate your help legend
@@onlineassignment4086 Legend ... haha! The latest part number I can find is A204 901 78 01 partsouq.com/en/catalog/genuine/unit?c=Mercedes-Benz&ssd=%24%2AKwF9SVhgDDQgEQYdHntaKCUxERYIeXZ7emh7RDRsPWp1bA8MNDQmImxzJjoiJWc0fyZ1fHx8dns0NWNYf206a3JtDARpOjptbXR4enx-fX46OmNtdHh7fH96eWtmciomCTNtOGtxNE9AC3x5fH98e3lXKjV5e35_bWJrJnU6Pm18eXx_fHtpOjp3LGxzam1iayZ9Oj5tf2tkbS0naSw6Mn0ea2RtOCppLDo1bTMAAAAAB1UvNQ%24&vid=0&cid=25495&uid=123045&q=wdd2040222a216577
Quick question Scott. I also have 2008 W204 (C300 Sport) here in the US. The" auto light inoperative" notification came up about 6 months ago. Thanks to your video, I have removed the sensor - the part number is A 204 870 4726. I realize that the part numbers get upgraded - the most recent part number I have discovered is 204 901 4504. If the part states that's it's compatible with W204, and looks identical, should I expect it to be interchangeable with my old part? Appreciate your expertise!
Thanks so much for your quick reply. Unfortunately, replacing the rain sensor did not fix my malfunction. Still have the same notification. Would you have any other thoughts for troubleshooting this issue? @@ScottElliott152
@@alexhatcher2904 You'd have to plug it into the MB STAR system to discover the fault code. Fortunately I have my own Chinese STAR system. You could try disconnecting the battery for a while but I doubt it will sort it out.
About 10.5 litre/100km for suburban driving. 7.0 litres/100km country driving at 110kph. I took the 115CDI for a drive on the weekend to a track 2 hours south. At a real 110kph it sits on 2500RPM. With the 2.92 diff it would be about 2225RPM which I think it would handle on a flat road. With the 2.45 diff it would be 1875 RPM. I think it would struggle at that.
Scott Elliott 7.0 for the 320Mmmm I thought they may have been better than that actually. I know the previous 320cdi with that beautiful inline 6 Diesel were fair bit better. With the Vito but if you put another 50+hp through she’d handle it but stock the 2.92 would be perfect. Hopefully in the next month I’ll able to do the swap. With exhaust, tune, filter & diff I’m looking forward very much to be cruising her around. I’ll give you the updates when it’s done
Scott Elliott the new 119cdi Vito with the souped up version of our 115cdi is nearly 59kph per 1000rpm, so 100kph is 1700rpm but has the 7speed Gtronic auto like your 320cdi. Wouldn’t it be cool to retrofit that transmission into our 115cd’s
@@paolouchicentofanti8494 yes it would be a great modification. It would not be an easy process as I imagine it wouldn't bolt straight in. Trying to sort out the electronics would be a nightmare. Probably the easiest way is to wait a few years and buy a 119.
Scott Elliott yes that’s my dream. What mpg are you getting in your Vito? Have you ever had an aircon issue with your Vito, mines leaking gas the bloody thing
Hello, I have replaced successfully rain sensor A2048704726, from w204 220cdi '08, with A2049017801. No coding was required. Maybe this info will help someone.
the serial number for my rain car senser is A204 820 1285 i replace it by another one under number A 204 901 7801 unfortunately is not working please advice me thanks
Haven’t posted in a bit ! Hope all is well. Love all your videos. You’ve been a life saver my friend.
Removed and fixed it back in and it worked. Error message doesn't show up anymore. Thanks a million 🤗
Took my C300 to dealership, they said the light/rain sensor needs to be replaced. Ordered it from eBay. Removed the old sensor, put the new one back there (by the way, putting metalic side clips and holes in the mounting place in the windshield area is a total pain and is not as easy as shown in this video,). After I plugged the power wire into the sensor, I still see the error: Auto light function inoperative shown on thr dashboard.
Took it to Mercedes dealership in Indianapolis, they said it needs to be programmed! and they charged me $182 to just program it, and it finally works.
Mercedes cars have so many electronic issues & are expensive to maintain.
I fear I’ll have to do the same. Replaced my sensor, still get the error. My local dealer charges $199.
I wish I had read the messages of the video before buying the new sensor at the stealership and finding out that it will need the car to be reprogrammed in order to recognize it.
Man your the best !
When i checked with my friend who owns workshop for luxury cars he told me it may risk the glass.
After watching ur video it seems as a bluff.
Risk the glass! That's BS. I can't see how on earth you could break the windscreen. It's such a simple job DIY.
@@ScottElliott152 yeah after watching your video i felt it like a bluff.
Can i get this part in Amazon ?
This one i can do myself if i get the parts.
@@rafioo7jb I got mine off eBay. They seem readily available.
@@ScottElliott152 So Glad I found this! Mine started doing it a week ago and Mercedez BenzSydney are the biggest rip off artists in the world! I'll pull mine out, get the part number and order off eBay same as you did :)
Thank you!
@@SimonTAMG It's simple job so don't shy away from it. Out of interest what did the MB dealer quote to supply and replace?
hey scott long time no see
just a question
with your DAS XENTRY car diagnostic tools
are you able to enter into the headlight module and switch intelligent lighting on or off?
i wish to switch off my intelligent light system permenantly off
Yes I've been busy doing a lot of riding. Yes I believe you can turn it off. Scott
@@ScottElliott152great mate ... also may i ask where you bought yours from ? and did you buy just the software or the complete set ? with computer
I bought the software preinstalled on an external HDD from here: www.obdexpress.co.uk/?gclid=EAIaIQobChMI-Ja4ubGK3gIVjLaWCh0Itg-3EAAYASAAEgKGc_D_BwE
Once I got used to it I joined www.mhhauto.com and downloaded earlier versions of Xentry/DAS that allow you to do things like change the variant coding. After 01-2011 MB starting locking things down so later versions don't give much access to anything. I mostly use DAS 08-2008 on a virtual machine using VMWare.
My c200 auto lights keep coming up on the dash and the wipers have a mind of their own i have them on the off setting and they still work at intermediate speed.They can be working but i can not change the speed or activate the washer fluid
I replaced the sensor but the light still did not reset. any ideas?? the fog lights turn on the way they should but the dummy light is still reading that its bad...
No ideas as I had no issues replacing it. Everything worked again as it should. You could try disconnecting the negative battery terminal for 10 minutes or so.
fixed my issue wipers stopped working unplugged it started working again
hey mate, thanks for the video. Where did you buy the replacement sensor from?
it was a used sensor from an eBay seller.
Thx. Alot . I really have the same problem . But i dont understand how did he remove the sensor
Watch the video again ... slow it down if you need to. It's simple.
he used his skills and a pick tool as demonstrated in the video.
the more I own my w212, the more I realize every system is designed to turn into a repair opportunity.
🙂
Hi Stuart, I replaced the old faulty sensor # ending in 8185 with new sensor #7801 and the error is still coming up. Not sure what I should do next. Any Ideas or suggestions very welcome. thanks, Patrick
You may need to remove the negative battery terminal for a few minutes. Also turn the lights off ... that is not on auto ... then turn them back to auto.
Looks very eazy, I'll order the part and will try. Thanks
Yes it is easy. Good luck.
The video Just on time :)
My sensor works sometimes (No reasction vs over reaction in rain) and auto lights seem slightly unreliable. No error codes. Just know it had a replacement screen at some point. Any ideas on fix? Thanks
Replace the sensor is about all you can do.
Thank you for the informative video
Thanks.
Does the sensor need to be calibrated?
The answer is in the video description.
Does this stop your window wipers from working
No ... Manufacturers would not make the wipers inoperative because the rain sensor failed. It's a safety issue.
@@ScottElliott152 I wouldnt say that, mine stopped working until I popped it out. had to drive home with no wipers.
@scott Elliott I have Vito w639 2014 and it doesn’t have auto light function, can I add it?
Yes you can add it. I think it will need SCN coding after you install the auto switch.
Is the procedure the same for W212? Error code says there’s a wiring fault. Thanks.
Roger I'm not familiar with the W212.
Did you have to reset anything? I did all that you did but, I'm still getting that message and the lights still come on and won't turn off.
No I didn't. If you're still getting the message then something's not right. Perhaps the sensor is not compatible ... is it new or used? Turn the lights off for a while. Also you could try disconnecting the battery for a short period which resets many of the control modules.
It is new. I did check to make sure that it is compatible. I'll try disconnecting the battery next. I thank you very much for responding to my question. I'll let you know how it works out for me. Thanks again for your help.
I had the error msg so I changed the sensor with a brand new one from Mercedes but it still chose the fault msg!! What should I do?
Disconnect the battery for a while. If it was a faulty sensor the error message will eventually go away.
@@ScottElliott152 thanks but it still didn't work
Will I have to recode when I replace the sensor?
No.
@@ScottElliott152 I was told that I would need to
@robertsessions8139 I showed everything I did in the video. After replacing the part, it worked again but the Dealers always say things need to be coded. If your rain sensor is faulty, you have no option but to replace it. You'll soon know if it's going to work and maybe some cars need coding but that wasn't my experience. What if you're in a more remote area .... are Mercedes going to leave you stranded because an item needs coding? I doubt a countries design rules would allow that to happen.
I replaced the sensor. Still get the message
@@robertsessions8139This was just posted by MariusPenta.
Hello,
I have replaced successfully rain sensor A2048704726, from w204 220cdi '08, with A2049017801. No coding was required. Maybe this info will help someone.
Hello Scott! If i have only the light sensor, can i upgrade to a light/rain sensor just like yours? Do i need to code the sensor?
It depends if your car has the software already installed for the rain sensor wipers. If it has then you would need to edit the coding. If your car doesn't have provision for the rain sensing wipers (you don't say what you have) then you'll only be able to use the light sensor.
Scott Elliott my currently sensor installed is A 204 870 3526. How i can find out if my car is having provision for the rain sensing wipers? Thx! (Vin: WDD2040021A320997)
@@marianbarbu8513 You'd have to connect it to DAS/Xentry to read the current coding. See if you can find an independent with the Mercedes software. That part number is a combined rain/light sensor so it might be a case of activating the rain sensor wipers.
Hi scott, just wondering as my wiper works totally fine in auto but when i turn on my key i got message of auto light inoperative as light remains on always, is that the same problem from sensor or different things.
That will most likely be a faulty light/rain sensor.
@@ScottElliott152 my car is completely same car with same parts number that you are showing so do i have to change as same like you did and is there any other parts number i can suit to this part as in Australia its pretty expensive. Highly appreciate your help legend
@@onlineassignment4086 Legend ... haha!
The latest part number I can find is A204 901 78 01
partsouq.com/en/catalog/genuine/unit?c=Mercedes-Benz&ssd=%24%2AKwF9SVhgDDQgEQYdHntaKCUxERYIeXZ7emh7RDRsPWp1bA8MNDQmImxzJjoiJWc0fyZ1fHx8dns0NWNYf206a3JtDARpOjptbXR4enx-fX46OmNtdHh7fH96eWtmciomCTNtOGtxNE9AC3x5fH98e3lXKjV5e35_bWJrJnU6Pm18eXx_fHtpOjp3LGxzam1iayZ9Oj5tf2tkbS0naSw6Mn0ea2RtOCppLDo1bTMAAAAAB1UvNQ%24&vid=0&cid=25495&uid=123045&q=wdd2040222a216577
@@ScottElliott152 just wondering does your car also have fault only on auto lights or wiper too.
@@onlineassignment4086 can't recall as it was so long ago. The sensor controls both the auto lights and rain sensing wipers.
Quick question Scott. I also have 2008 W204 (C300 Sport) here in the US. The" auto light inoperative" notification came up about 6 months ago. Thanks to your video, I have removed the sensor - the part number is A 204 870 4726. I realize that the part numbers get upgraded - the most recent part number I have discovered is 204 901 4504. If the part states that's it's compatible with W204, and looks identical, should I expect it to be interchangeable with my old part? Appreciate your expertise!
Alex yes that should work fine. There appears to be many compatible part numbers you can use. Let us know how you go. Scott
Thanks so much for your quick reply. Unfortunately, replacing the rain sensor did not fix my malfunction. Still have the same notification. Would you have any other thoughts for troubleshooting this issue? @@ScottElliott152
@@alexhatcher2904 You'd have to plug it into the MB STAR system to discover the fault code. Fortunately I have my own Chinese STAR system. You could try disconnecting the battery for a while but I doubt it will sort it out.
@@ScottElliott152 Do you have an idea about the SAM fuse module on Mercedes C200 W204,
@@Silvadore1 no I've not worked on the SAM. Join www.benzworld.org as you should find the information there. Someone will know.
Hi SCOTT, what sort of mpg figures does your c320cdi get
About 10.5 litre/100km for suburban driving. 7.0 litres/100km country driving at 110kph.
I took the 115CDI for a drive on the weekend to a track 2 hours south. At a real 110kph it sits on 2500RPM. With the 2.92 diff it would be about 2225RPM which I think it would handle on a flat road. With the 2.45 diff it would be 1875 RPM. I think it would struggle at that.
Scott Elliott 7.0 for the 320Mmmm I thought they may have been better than that actually. I know the previous 320cdi with that beautiful inline 6 Diesel were fair bit better.
With the Vito but if you put another 50+hp through she’d handle it but stock the 2.92 would be perfect. Hopefully in the next month I’ll able to do the swap. With exhaust, tune, filter & diff I’m looking forward very much to be cruising her around. I’ll give you the updates when it’s done
Scott Elliott the new 119cdi Vito with the souped up version of our 115cdi is nearly 59kph per 1000rpm, so 100kph is 1700rpm but has the 7speed Gtronic auto like your 320cdi. Wouldn’t it be cool to retrofit that transmission into our 115cd’s
@@paolouchicentofanti8494 yes it would be a great modification. It would not be an easy process as I imagine it wouldn't bolt straight in. Trying to sort out the electronics would be a nightmare. Probably the easiest way is to wait a few years and buy a 119.
Scott Elliott yes that’s my dream. What mpg are you getting in your Vito? Have you ever had an aircon issue with your Vito, mines leaking gas the bloody thing
Hi there, I've replaced the auto lights sensor but still auto lights is inoperative. Bought it new from dealership here in nicosia.
Hi Douglas ... turn the car off and on again. If that doesn't work you'll have to go through a logical process of elimination. Check fuses etc.
use your ODB2 Scanner to simply reset controler module or pay a specialist to relieve from this shore.
Where can I purchase the new sensor
Search the part number in eBay or Google. I bought a used item off eBay from a breaking yard as new sensors are expensive and appear hard to get.
Apologies I meant Hi Scott,
Hello,
I have replaced successfully rain sensor A2048704726, from w204 220cdi '08, with A2049017801. No coding was required. Maybe this info will help someone.
Great vid thanks for instruction, updated part # A2049014504
Thanks Tony.
I appreciate your videos Scott, knowing someone like yourself with your experience believes in the W204 is good to know
It’s plug & play so you don’t need to code it
the serial number for my rain car senser is A204 820 1285 i replace it by another one under number A 204 901 7801 unfortunately is not working
please advice me thanks
You don't say what Mercedes model you have. Input your VIN into this parts site to find the part numbers for your particular vehicle. www.partsouq.com